I prefer it to a 'normal' hold out, mainly because if the anchor point on the left arm fails for any reason, nothing will shoot out of your sleeve. Also, the gearing means that you need a much smaller action to action the thief.
Concerning that, I did have some issues with snagging due to its size, but I solved that by installing a SuperM business end instead, so now I get the best of both worlds.
I did design and install a lock for it, but it is still in R&D at the moment.
Hope that helps.